Soy-castor oil-based polyurethane acrylate prepolymer (SCPUA) was synthesized by using epoxidized soybean oil and ricinoleic acid as raw materials, and a cost-effective halogen-free flame retardant phosphorous silicon methacrylate monomer (PSMAM) was also synthesized and used as an efficient reactive diluent to mix with SCPUA to develop a novel vegetable oil-based UV-curable coating system. Benefited from the addition of PSMAM, the limiting oxygen index (LOI) of the coatings reaches up to 23%, and the coatings can self-extinguish instantly (within 1 s) after removing from flame, indicating that these coatings possess remarkable flame-retardant performance. Also, the flame-retardant mechanism is proposed, and it reveals that PSMAM promotes the formation of a dense and continuous char layer on the coating surface to serve as a heat and oxygen barrier, thus providing the coatings with remarkable flame retardancy. Besides, the use of PSMAM can improve the thermal stability of the coatings. More strikingly, these coatings exhibit excellent hardness (6H), flexibility (2 mm), adhesion (4B) and remarkable acid and alkali resistance as well as boiling water resistance. Therefore, excellent performances and cost-effective feature as well as the facile synthesis process make these newly-developed halogen-free flame-retardant vegetable-oil based UV-curable coatings more potential for practical applications.

以环氧化大豆油和蓖麻油酸为原料合成了大豆蓖麻油基聚氨酯丙烯酸酯预聚体（SCPUA），并合成了一种具有成本效益的无卤阻燃甲基丙烯酸磷硅单体（PSMAM），并将其用作与 SCPUA 混合的高效活性稀释剂，以开发一种新型植物油基 UV 固化涂料体系。受益于PSMAM的加入，涂层的极限氧指数(LOI)高达23%，涂层离火后即刻（1s内）自熄，表明这些涂层具有卓越的阻燃性能。表现。此外，还提出了阻燃机制，结果表明，PSMAM促进了涂层表面致密连续炭层的形成，起到了隔热和氧气屏障的作用，从而为涂层提供了显着的阻燃性。此外，PSAM的使用可以提高涂层的热稳定性。更引人注目的是，这些涂层表现出优异的硬度 (6H)、柔韧性 (2 mm)、附着力 (4B) 以及卓越的耐酸碱和耐沸水性能。因此，优异的性能和成本效益以及简便的合成工艺使这些新开发的无卤阻燃植物油基紫外线固化涂料更具实际应用潜力。更引人注目的是，这些涂层表现出优异的硬度 (6H)、柔韧性 (2 mm)、附着力 (4B) 以及卓越的耐酸碱和耐沸水性能。因此，优异的性能和成本效益以及简便的合成工艺使这些新开发的无卤阻燃植物油基紫外线固化涂料更具实际应用潜力。更引人注目的是，这些涂层表现出优异的硬度 (6H)、柔韧性 (2 mm)、附着力 (4B) 以及卓越的耐酸碱和耐沸水性能。因此，优异的性能和成本效益以及简便的合成工艺使这些新开发的无卤阻燃植物油基紫外线固化涂料更具实际应用潜力。